Method of and apparatus for working paper stock



April 28, 1925. 1,535,834

A. J. HAUG METHOD OF AND APPARATUS FOR WORKING PAPER STOCK April 28, 1925.

A. J. HAUG METHOD 0F AND APPARATUS FOR WORKING PAPER STOCK Filed April 6. 1921 e sheets-sheet 2 METHOD OF AND APPARATUS FOR WORKING PAPER STOCK Filed April 6. 1921 6 Sheets-Sheet 5 April 28, 1925. 1,535,834

A. J. HAUG METHOD OF AND APPARATUS FOR WORKING PAPER STOCK Filed April 6, 1921 6 Sheets-Sheet 4 April 2s, 1925.

A. J. HAUG METHOD 0F AND APPARATUS FOR WORKING PAPER STOCK 'e sheets-sheet' s Filed April 6. 1921 fig.

'IW/vena?.- Ta-on J April 28, 1925. l 1,535,834

A. J. HAUG METHOD 0F AND APPARATUS FOR WORKING PAPER STOCK Filed April 6. 1921 by M'MM/gi es.

Patented pr. 28,v 19,25.

VUNI'rI-:D STATES- 1,535,834 PATENT oFFlcia.`

' ANTON J. HAUG, OF NASHUA, NEW HAMPSHIRE, ASSIGNOR T0. 4IIYIIPRO'VED PAPER MACHINERY COMPANY, OF NASHUA, NEW HAMPSHIRE,

MAINE.

A CORPQRATION F METHOD 0F AND APPARATUS FOR WORKING PAPIERl STOCK.

Application led April 6, 1921. Serial No. 459,057.

To all 'whom it may concern:

Be it known that I, ANTON J. HAUG, a citizen of the United States, and a resident of Nashua, county of Hillsborough, and

State of New Hampshire, have invented an Improvement in Methods of and Apparatus for lrVorking Paper Stock, of which the following description in connection with the accompanying drawings is a specification, like characters onthe drawings representing like parts.

This invention relates tp methods of and apparatus for working paper stock and other materials, and has for its object the provision of improved methods and appliances which may be employed in preparing crude pulp from raw material, or in working thev crude pulp to a more refined state, say in working over the tailings or residue from screened stock and rendering it useful.

The invention will be best understood by reference to the following description, when taken in connection with the accompanying drawings of one specific embodiment thereof, while its scope will be more particularly pointed out in the appended claims.

. In the drawings:

Fig. l is an elevation of a machine exemplifying the invention, -and by means of which the method may be carried out;

Fig. 2 is a central, longitudinal sectional view of the same, looking in the opposite direction from Fig. 1

Fig. 3` is a sectional view on line 3 3 of Fig. 2, looking in the direction of the arrows on said line;v

Fig. 4 is a sectional view on line 4 4 of Fig. 2, looking inthe direction of the arrows on said line;

y Fig. 5 is a sectional view on line 5 5 of Fig. 2, looking in the direction of the arrows on said line; Y

Fig. 6 is a sectional View on line 6 6 of Fig. 2, looking in the direction of the arrows on said line;

Fig. 7 is a sectional view on line 7 7 of Fig. 2, looking in the direction of the arrows on said line; l

F'ig. 8 is a sectional view on line 8 8 of Fig. 2, looking in the direction of the arrows on said line;

Fig. 9 is a sectional view on line 9 9 of Fig. 1, looking in the direction of the arrows on said line; e

Fig. 10 is a detail sectional view on an enlarged scale of a ortion of Fig. 2;

Fig. 11 is a detail sectional vicwon an enlarged scale of a portion of Fig. 2; and

Fig. l2 is a detail sectional view on line 12 l2 of Fig. 2.

Referring to the drawings, and to the embodiment of the invention selected for exempliication, there is shown a machine of the general character exemplified b U. S. Letters Patent No. 1,302,469, issue to me April 29, 1919, and intended primarily for refining crude pulp, and especially tailings or rejections from a prior screening operation, although the same principle and substantially the same mechanism and appliance may be usefully employed in reducing raw materials to the form of a crude pulp, the machine being capable of useful employment in connection with materials (herein generally termed paper stock) of widely different condition, such for example as more or less unreduced fibrous material or pulp reduced to a more or less crude state.

Referring first to the general characteristics of the machine illustrated in the drawings, the same has relatively movable surfaces between which the stock is worked, the latter being subjected to a succession of crushing actions. In the present example, one of these surfaces is the internal cylindrical surface of a4 cylindrical shell 14 (see Fig. 7), within which one or more, herein four cylindrical rolls 16 are arranged lengthwise of the shell and adapted for cooperation with the internal surface of the latter. The desired rolling action is furnished by causing relative turning movement of the rolls and shell, although in the 'present instance` the latter is fixed and the former are revolved by mechanism presently to be described.

Herein the shell is a preferably continuous lining for a casing comprising upper and lower separable parts 18 and 20, secured together by sets of bolts 22 and 24"(see Fig. 7 The lower part is conveniently supported by providing the same with feet 26 resting upon and bolted to a base 28, as by bolts 30.

The rolls 16 are provided with shafts 32 (see Fig. 2), journaled at both ends in bearings 34 mounted to move -radially inward and" outward, and tol rock about axes ex-.

tending tranversel of the axes ofv said "shafts, To this .en each bearing-.(see Eig.

ach of the spiders is keyed to a main i VdriveL shaft 42, the latter being mounted in bearings 44 at opposite ends ofpthe machine, and being provi ed at one end wlth a pulley 46 whlch is'used to drive the rotary feeding device hereinafter described. When, therefore, the shaft 42 is rotatedkit carries with it the spiders 40, yokes 36, bearings 34, shafts 32 and rolls 16, thus causlng the latte;` to revolve about within the cylindrical shell 14. Centrifugal force is relied upon to produce the crushing action, due to the tendency of the rolls to flyrout against the internal surface of the shell, while they are being revolved, but herein Springs 48 are provided (see Figs. 2 and 3) to prevent the uppermostroll from falling when the machine is stopped.

Naturally, the outward pressure of the rollers against the internal surface of the shell will cause the rolls to be rotated about their own axis as they are revolved about the axis of the main shaft., and in some classes of work this action alone may be relied upon to produce the turning motion of the rolls. Under some circumstances, however, it is desirable to have a positive turning motion imparted to the rolls, and in such case this may be accomplished by planetary gearing including a set of pinions 50 keyed on the shafts 32, and meshing withan internal gear 52, the latter being fixed to the casing. If true rolling motion of the rolls against the shell is desired, the pitch circle of the internal gear will be the same diameter as the internal surface of the shell, but if it is desired to have thel rolling action accompanied by a rubbing or abrasive action, this may be accomplished by making the pitch circle of the internal gear larger or smaller in diameter than the internal surface of the shell.

The machine herein exemplified is continuous in its action, and to that end, the stock is introduced at one end of the casing through an inlet passage 54 and is discharged from the other end of the casing through the outlet 56. In order progressively to advance the stock from the machine between each crushing or reducing action of the successive rolls, suitable feeding devices are preferably employed. Herein these comprise a series of devices which form in effect a mechanical screw conveyor acting to convey the material from one end of the machine to the other, while subjecting it to the repeated reducing action of the rolls. In the present example, these conveyor devices are in the form of inclined or helical vanes 58, best vunserem.

the drive shaft 42; The conveyor as thu-s` constituted extends lengthwise of the drum of .spiders y secured to beyond the effective portions of theV rolls into the inlet chamber, so that as soon -as the stock is delivered l to the latterv it becomes subject to the action of the conveyor.. At

the opposite end of the machine in the outi letachamber, blades or paddles 64 are provided (seeFigs. 2 and 5) carried by the adjacent splder 40, the blades or paddles roytating within the chamber and tending to work the materialfout through its outlet.

These blades herein are conveniently formed lintegrally with a flange 66 mounted on the hub of the spider 40.. There-is a similar flange 67 at the inlet end of the machine, but it has no blades.

The ends of the shafts 32 and their bearings, as well as the driving mechanism, are enclosed by similar housings 68 and 70, and the interiors of each are separated from the pulpi chamber by partitions 72 and 74. In practice, it is found that if no packing is provided at these points, the pul works into the transmission and bearing c ambers, gets into the bearings and gears, and clogs up the spaces, so that after a time it is necessary to stop the machine and clean it out. This is especially troublesome in the Case of the employment of a lubrication system such as that presently to be described, as the pulp mixes with the oil andclogs the oil pipes as Well as the strainers. An important feature of my present invention is the provision of packing which prevents substantial leakage of the pulp from the pulp chamber into the bearing housings, and on the other hand prevents oil from working from the latter into the former. In the present example, there is provided a packing in the form of a felt ring 76 interposed between the flange 66 and the partition 72 (see Fig. 11'), and similarly a packing ring 78 is interposed between the flange 67 and the partition 74 (see Fig. l0) These rings may be held against turning movement by spurs 80 and 82 projecting from the partitions 72 and 74 into the rings. The flanges 66 and 67 are provided with openings 84 and 86 for the shafts 32, said openings being of suflicient size to allow the shafts to move radially in and out in the be described, reference being had at first to Fig. 1. An oil reservoir 102 placed in an elevated position -is intended to contain a supply of oil which is fed by gravity through two outlet pipes 104 and 106 preferably having sight feeds 108 and 110. These pipes are provided within the reservoir with upturned inlets 112 and 114 at some distance above the bottom of the reservoir, thereby to avoid taking in sediment which gravitates to the bottom of the reservoir. These pipes. lead in opposite directions to the ends of the machine, where they are provided with suitable outlets herein nozzles 116 and.118, one of which is shown in detail in Fig. 12 secured to the housings 68 and-70, respectively. These nozzles discharge into central chambers conveniently in the form of oil rings 120 and 122 (see Fig. 2) concentric with the shaft42 and preferably secured thereto as by being bolted to the spiders. Each of these rings has an open end into which the corresponding 'nozzle delivers a continuous supply of oil, and they present annular channelsl having outlets 124 and 126, which deliver oil into receptacles 128 and 130 provided therefor and carried by bearings which they lubricate (see Figs. 2 and 3). Since the oil rings rotate with the spider which carries the bearings, a continuous supply of oil is provided for the latter, while still permitting a radial movement of the shafts and bearings. Some of the oil naturally finds its way to the gearing and lubricates the latter'.

All of the oil which drains from the mechanism is caught by the housings 68 and 7 0, and is received in drainage pockets 132 and 134 at the bottoms of the latter (see Fig. 2), where it is preferably strained by screens 136 and 138 preferably located in the sides of the pockets, as this position is best calculated to prevent any foreign matter such as'pulp from clogging them. The

ulp gravit-ates to the bottoms of the chamer, where it may be cleaned out by the use of clean-out plugs 140 and 142. 1

The oil is .taken from the drainage pockets through pipes 144 and 146 to. one or more, herein two lters 148, one of which is shown in detail in Fig. 9, where it is passed through fine wire fabric 150, which encircles and is supported by a perforated tube 152, having one end closed by a cap '154 and Lits other end supported by a cap .156 having an outlet 158. .From the latter, a pipe 160 leads to the inlet of a power-driven pump 162 (see Fig. 1), whose outlet is connected by a pipe 164 to the reservoir 102, where it has a downwardl directed outlet 166 (see Figs. 3 and 4). T e reservoir is normally closed by a suitable cover 168, herein hinged to the body of the reservoir, and .provided with a handle 170 by means of which it may be opened to renew the supply of oil from time to time. A drain-cock 172 (see Fig. l) may be provided at the bottom of thereservoir to drain the sediment therefrom.

In the present embodiment,-the stock is delivered to the inlet 54 by a hopper 174, which to assist the uniformity of feed is provided with a rotary feeding device 176, best shown in Fig. 6, presenting radially projecting feeding fingers 178, which assist in the delivery of the stock to the inlet /chambelg Awhile at the same time checking any tendency toward an' excess delivery, as well as assisting in breaking apart any thick masses or bunches of stock. Suitable means are provided for driving the feeding device, herein a bevel gear 180, which meshes with a corresponding gear (not shown) carried by a shaft 182.

The fingers on the rotary feed device cooperate with other members, such as fingers 184 carried by an adjustable plate 186, best shown in Fig. 2, the same being provided with a pin 188 mounted to slide vertically in a slot 190, in which it is held adjustably fixed by a nut 192. By this means, the plate-may be moved vertically to any desired position within the range of adjustment, thereby causing the lingers 184 to enter to a greater or less extent between the rotary fingers 178, or to be withdrawn beyond their path if desired. By this means, the rate of feed may be regulated within suitable limits.

The operation of the machine as thus far described will be readily understood. The stock on entering the cylinder'is subjected to the crushingand reducing action of one ofthe rolls. first roll, it is engaged by the approaching part of a conveyor blade 58, which acts not only .progressively to advance the material lengthwise of the cylinder before delivery to the next roll, but also to scrape up and agitato the material in its flattened sheetlike form, and heap it up in front of the next approaching roll in the form of a relativelyflattened mass. The material is then again rolled and crushed by the next adjacent roll, and the same action is repeated over and over again. The conveying devices progressively 'advance the stock between successive reducing action lengthwise of the rolls, so that the same stock meets the same roll at an advanced position lengthwise of the machine.

Emerging from beneath the ler blade would feed it along.

In handling some grades ofstock, itis found that the latter tends to cling to the rolls, and not to the shell. The surface of the latter remains practically clean. Under these circumstances, the propeller blades would be ineffective for feeding. The stock would continue to build up on the roll until it produced a coating so thick Athat it would break apart, whereupon the propel- As the stock would continue to build up and the rolls recede from the shell, an increasing amount of power would be required. to drive the machine, sometimes amounting to an overload of from 50 to 100 per cent. As soon as the coating on the rolls would break apart, the latter would fly out again against the shell, and the machine would speed up, and this action be continued over and over again. This produced an irregular action of the machine, and it lacked the desired uniformity, since under different conditions at4 different times, the stock would break loose from the rolls with different amounts of accumulation on the rolls. Moreover, when a thick coating is built up on the rolls, the crushing act-ion is so diminshed that the slivers on the outer layers of the coating do not receive the necessary crushing action, and it follows that the stock would tend to come through the machine in an insufficiently crushed condition.

rI`his difliculty is entirely overcome by the provision of Scrapers 194 (seo Figs. 2 and 7) carried by the conveyor blades 158 and preferably separated from their respective rolls by a slight clearance,-in practice from la to 1/.3 of an inch. The action of the scrapers is to prevent the stock from building up on the rolls beyond a certain amount. It follows that a uniform feed and uniform crushing action is maintained, and the amount of power required to drive the machine is kept within reasonable limits, the variation in practice not exceeding l0 per cent., as compared with 50 to 100 per cent. without the use of these scrapers.

It has been found in practice that a broad scraper blade creates too much reaction and requires toogreat power, owing to the stock building up on the blade. Therefore, a narrow or wire-like formation of the scraper such as that shown in the drawings is ing cloggmg.

preferred as it simply breaks up. the coating within a certain height, without caus- The coating then drops olf against the conveyor blades, by which it is again carried forward to another point, where it receives another rolling or crushing action. The conveyor blades and scrapers rotating as they do with the shaft 42 are assisted in their action upon the stock by the centrifugal force exerted thereagainst which causes the detached stock to fly out against the inner surface of the shell 14.

The Scrapers, therefore, constitute an important improvement in the treatment of any stock which has a tendency to stick to the rollsi Having thus described one embodiment of my invention, but without limiting myself thereto, what claim and desire by Letters Patent to secure is:

Claims.

1. In a machine for working paper stock or other material having an inlet and outlet the combination of relatively movable parts having opposed surfaces between which the material is subjected to a crushing action, and means for limiting the amount of material adhering to both surfaces throughout while progressively advancing the material toward the outlet end of the machine.

2. In a machine for working paper stock or other material, the combination of relatively movable parts having opposed surfaces between which the material is subjected to a crushing action, devices closely related to one surface for removing material therefrom, and devices closely related to the other surface for removing material from said other surface.

3. In a machine for working paper stock or other material, the combination of a cylindrical shell; one or more rolls whose cylindrical surfaces cooperate with the internal cylindrical surface of said shell to subject the material to, a crushing action, and means engaging the material on the rolls to prevent the same from building up on said rolls beyond a certain amount.

4. In a machine for working paper stock or other material, the combination of relatively movable parts having opposed surfaces one of which is an internal cylindrical surface and the other a cooperating roll,

mea-ns to cause relative movement of said v surfaces to subject the material to a crushing action, and means to bre-ak upsubstantially the entire coating of material adhering to the roll.

5. In a machine for working paper stock or other material, the combination of a roll having a planetary movement, a curvilinear stock-receiving surface over which said roll works, means for presenting stock to said roll on said surface, and means also having a planetary movement for scraping stock off said roll throughout and impelling it toward said surface.

6. In a machine for working paper stock or other material, the combination of relatively movable parts having opposed surfaces between which the material is subjected to a crushing action, and means for progressively advancing the material along said surfaces step by step, said means including means for limiting the amount of material adhering to both Surfaces throughout,

.Y norvother material, the combination of a cylindrical shelhne or more rolls whose cylindrical surfaces cooperate with the internal cylindrical surface of said' shell to subject the material to a crushing-action, means for f 4conveying material lengthwise of said roll or rolls, and means carried by said conveying means, to prevent the material from building upon'said rolls beyond a certain amount.

8. In a machine for working paper stock or other material, the combination of a cylindrical shell, one or more rolls whose cyl lindrical surfaces cooperate with the internal cylindrical surface of said shell to subject the material to a crushing action, obliquely disposed blades for conveying material lengthwise of said roll or rolls, and scrapers carried by and interposed between said blades to scrape the'material from said roll or rolls. if

9. In a machine for working paperjstock or other material, the combination of a cylindrical shell, one or more rolls whose cylindrical surfaces cooperate with the internal cylindrical surface of said shell to subject the material to a crushing action, means for conveying material lengthwise of said roll or rolls, and scraping means extending lengthwise of said roll or rolls for scraping the material therefrom.

10. In a machinefor working paper stock or other material, the combination of a casinghaving a cylindrical, internal surface, one or more rolls therein adapted to roll along said surface and to crush the mate` rial between said rolls and said surface, and means engaging material adhering throughoutsaid roll or rolls to limit the amount thereof. v I

11. The process of working paper stock er other material which is characterized by subjecting the same to a crushing action between opposed surfaces and removing material from both surfaces throughout by a centrifugal scraping action.

12. In a machine for working paper stock or other material, the combination of two bodies between which the material is worked, one' of said bodies being rotary, a bearing for supporting said'rotary body, and planetary driving means for said body interposed between said bearing and said body.

13. In a machine for working paper stock or other material, the combination of two bodies between which the material is worked, one of said bodies being a roll having a planetary movement and provided with a shaft, a. bearing for said shaft, and driving means for said shaft, interposed between said bearing and said body.

14. In a machine for working paper stock or other material, the combination of two one of said bodies being a roll provided with I a shaft the latter being adapted to revolve with a planetary movement, a bearing for said shaft, and driving means for said shaft,

.including a gear secured to said shaft inter mediate said bearing and said body.

l5.v In a machine for working paper stock or other material, the combination of a lurality of bodies by which the materia is worked, one of said bodies being a hollow cylinder and the others being rolls extending lengthwise of and within said cylinder,

vshafts projecting beyond the ends of said rolls, bearings for said shafts, means for maintaining said bearings properly spaced, and gearing for imparting a relative rolling motionto said cylinder and rolls to cause the latter to travel along the former, said gearing being interposed between said bearings and said rolls. V

1G. In a machine for working material, the combination of means presenting a chamber wherein the material is worked, means within said chamber for working the material, driving means without said chamber for driving said means within said chamber, a housing providing an enclosing chamber lfor said driving means, and packing means to prevent material from working from said rst chamber into said second chamber.

17.- In a machine for working material, the combination of means presenting a chamber wherein the material is worked, means within said chamber for working the material, driving means without said chamber for driving said means Within said chamber, a housing for said driving means, a driving connection relatively movable parts through which said driving connection passes and permittlng transverse movement thereof during operation of the machine, said relatively movable parts presenting a partition a between said'chamber and and the interior said parts.

18. In a machinev for working-material, the combination of a hollow cylinder presenting a chamber wherein the material is worked, means including a roll within said chamber for working the material, a driving shaft, driving means without said chamber, a housing for said driving means, and means through which said shaft passes presenting a duid-tight separation between said chamber and the interior of said housing while permitting transverse movement of the shaft.

19. In .a machine for working material, the combination of a hollow cylinder presenting a chamber wherein the material is worked, means including a roll within said chamber for working the material, driving means without said chamber for driving bodies between which the material s worked,said roll, a housing for said driving means,

- ter osed between sai mea resenting two relatively rotatable walls se arating said -chamber from the 1nterior o said housing, and packing means' interposed between said walls.

20. In a machine for worklng material, the combination of a hollow cylinder preu sentin a chamber wherein the material is worke means including a roll within said chamber for working the material, a shaft projecting from the end of said roll, drlving means Without said chamber for d rlvlng said shaft, a housing` for said drivlng means.

`means presenting two relatively rotatable terior of said housing to lubricate said driving means, and means presenting a fluidtight separation between said chamber and the interior of said housing.

22. In a machine for working paper stock or other material, the combination of means for working the Vmaterial, driving `mechanism therefor, and an oil circulating system for said driving mechanism.

23. In a machine for working paper stock or other material, the combination of means for working the material, driving mechanism therefor, and an oil circulating system for said driving mechanism, said system including means for separating the oil from the paper stock.

24. In a machine for working paper stock or other material, the combination of means for Working the material, driving mechanism therefor, and an oil circulating system for said driving mechanism, said 'system including means for straining the oil after it has passed said driving mechanism and before it is again delivered thereto.

25. In a machine for working paper stock or other material, the combination of means driving mechanism, means for straining the oil after it has passed said mechanism, and a pump for returning the oil to said reservoir.

27. In a machine for .working paper stock or other material, the combination of means for working the material, driving mechanism therefor including shafts, bearings fory said shafts, and lubricating means including a central chamber from which oil is distributed to said bearings. s i

28. In a machine for working paper stock or other material, the combination of means for working thev material, driving mechanism therefor including shafts which revolve `about a center, bearings for said shafts, a rotating carrier for said shafts, and lubricating means including a central chamberfrom which oil is distributed to said bearings.

29. In a machine for working paper stock or other material, the combination of means for working the material, driving mechanism therefor including shafts which have a planetary motion, bearings for said shafts,

y bricating means including a rotating part presenting a central chamber having outlets supplying oil to said bearings, and means including a non-rotating part supplying oil to said chamber.

31. In a machine for working paper stock or other material, a casing having a curved stock-receiving surface, one or more rolls within the casing, means for moving the rolls through an orbital path within the casing, and a scraping device cooperatively related to substantially the entire length of the roll.

32. In a machine for Working paper stock or other material, a casing having a curved stock-receiving surface, one or more rolls within the casing, means for moving the rolls through y an orbital path within the casing, and a narrow wire-like scraping device cooperatively related to the roll.

33. A machine for working paper stock having a. casing presenting a curved stockreceivng surface, one or more rolls within the casing, means to cause the roll to move over the curved surface in an orbital path, and scraping devices for the roll and for the surface also movable in an orbital path and adapted to remove the accumulated material nd impel it against the stock-receiving surace.

lroll, means fr causing the roll to travel over the 'interior surface of the cylinder, and scraping devices traveling with the roll and operatively related, one to the surface of the cylinder and another to the roll.

35. In a machine for working paper stock, the combination with means presenting a chamber wherein the material is worked, means within Said chamber for working the material and comprising one or more rolls having each a movement of rotation about its axis and movement in an'orbital path, driving mechanism for imparting said movement to said roll including a driving shaft extending into said chamber, said shaft and roll being capable of transverse outward or inward. movement, and a partition between the chamber and the driving means having a suitably packed orifice to. prevent the escape of paper stock therethrough while permitting said transverse movement. y ,I

36. A machine for working paper stock having a casing with one or more rolls, said roll being adapted to travel through an orbital path through the interior of said casing and supported to permit a radial inward and' outward movement under variations of 'centrifugal force, driving mechanism, a partition separating the chamber from said driving mechanism, a shaft extending through said partition, and provision for permitting the necessary radial inward or outward movement of said shaft while preventing the escape of stock from' said chamber.

37 In a machine for working paper stock or other material, the combination with means for working the material including one or more rolls adapted to ope-rate, a stock working chamber, planetary gearing for imparting to said rolls both a movement of rotation and a movement through an orbital path, a housing enclosing said gearing, a partition separating the same from the stock working chamber, and an oil circulating system for feeding oil to said planetary gearing. 4

38. A machine for working paper stock having a stock working chambe-r and one orv more rolls therein, planetary driving gearing for one or more driving shafts for said rolls, the latter having a' planetary mo tion, a bearing or bearings .for said shaft or shafts, means separating said driving gearing from the Working chamber, and lubricating means including a central chamber from which oil is distributed to said bearing or bearings.

In testimony whereof, I have signed my name to this specification.

4ANTON J. HAUG. 

